![example testpattern](tve.jpg)

## pd-tve

A Slowscan Television testcard reference generator inspired by the
Spanish TVE custom PM5544 PAL reference signal.

It's not a pretty set of pixels-- there's no pixels involved at all--
the audio waveform output is calculated at every sample, and is as
close to Analogue as you can get with a computer. (The 48000 Hz
sampling rate was the limit of my USB audio interface..)

Note that the output is a continuous function in the frequency domain,
reducing sideband effects from step changes in frequencies that
'downsampled' images produce in normal SSTV software. (See my
pd-encode.py project for an image encoder with this feature.)

A few liberties have been made from the original Carta de ajuste
reference (those are 95% EBU colour bars, not 75%), and the
castellations weren't considered necessary. The resolution gratings
have their pitch continuously increased to make mode comparisons
easier, as the original's colour carrier interference effect isn't
applicable.
